What is infrastructure as code?

Infrastructure as code means defining servers, networks, and other infrastructure in version-controlled configuration files rather than provisioning them manually, so changes can be reviewed, tested, and reproduced reliably.

What language does Terraform use?

Terraform configurations are written in HashiCorp Configuration Language (HCL), a declarative, relatively readable syntax designed specifically for describing infrastructure resources.

What is Terraform state?

The state file is Terraform's record of the real infrastructure it manages, mapping configuration resources to actual cloud objects. Terraform uses it to calculate what needs to change on each run.

Is Terraform only for AWS?

No. Terraform is cloud-agnostic and has providers for AWS, Azure, Google Cloud, Kubernetes, and hundreds of other platforms and SaaS tools, so the same workflow can manage infrastructure across multiple providers.

How is Terraform different from Ansible?

Terraform is primarily used to provision infrastructure itself — servers, networks, databases — while Ansible is typically used to configure software on machines that already exist. Many teams use both together.

What is a Terraform module?

A module is a reusable, packaged set of Terraform configuration — for example, a standard VPC or database setup — that can be called with different inputs across multiple projects instead of duplicating the same resource definitions.

The core Terraform CLI is open source and free. HashiCorp also offers paid products like Terraform Cloud and Terraform Enterprise for team collaboration, remote state, and governance features.

What happens if two people run Terraform at the same time?

Terraform supports state locking on remote backends, which prevents concurrent runs from corrupting the state file by making one operation wait until the other completes.

DevOps

Terraform

By HashiCorp

IntermediateTool9.2K learners

Terraform is HashiCorp's open-source infrastructure-as-code tool for defining, provisioning, and managing cloud and on-premises infrastructure through declarative configuration files.

#Terraform #DevOps#Tool#Intermediate#AWS #Azure #Kubernetes #Ansible #SoftwareDelivery#Glossary#SkillVeris

Definition

Terraform is HashiCorp's open-source infrastructure-as-code tool for defining, provisioning, and managing cloud and on-premises infrastructure through declarative configuration files.

Overview

Terraform lets teams describe the desired state of their infrastructure — servers, networks, databases, load balancers — in a human-readable configuration language (HCL), rather than clicking through cloud consoles or writing imperative scripts. Terraform compares this desired state against the real infrastructure using a state file, computes the difference, and generates an execution plan showing exactly what will be created, changed, or destroyed before anything is applied. This provider-based architecture is what gives Terraform its broad reach: providers exist for AWS, Azure, Google Cloud, and hundreds of other services, letting a single tool and workflow manage infrastructure across multiple clouds and even manage resources inside a Kubernetes cluster. Modules allow teams to package and reuse common infrastructure patterns — a standard VPC layout or a Kubernetes cluster setup — across projects and environments. Terraform is often discussed alongside configuration-management tools like Ansible: Terraform focuses on provisioning the infrastructure itself, while Ansible (or Terraform's own provisioners) typically handles configuring software once machines exist. It's also part of a broader HashiCorp toolchain that includes Vault for secrets management and Packer for building machine images. Because infrastructure as code is now a baseline DevOps skill, courses like Terraform & Infrastructure as Code and posts such as Infrastructure as Code Explained: Terraform Basics are common starting points for engineers picking it up.

Key Features

Declarative configuration language (HCL) describing the desired end-state of infrastructure
Execution plans that preview exactly what will change before anything is applied
State file tracking the real-world resources Terraform manages
Provider ecosystem covering AWS, Azure, GCP, Kubernetes, and hundreds of other services
Reusable modules for packaging common infrastructure patterns
Remote state backends and locking for safe collaboration across teams
Import capability for bringing existing, manually created infrastructure under management
Workspaces for managing multiple environments (dev, staging, prod) from one configuration

Use Cases

Provisioning cloud infrastructure consistently across AWS, Azure, and GCP

Managing multi-environment setups (dev/staging/production) from shared modules

Standing up Kubernetes clusters and their supporting cloud resources

Enforcing peer-reviewed, version-controlled infrastructure changes via pull requests

Disaster recovery — rebuilding entire environments from code after an outage

Managing DNS, networking, and security group configuration as code

History

Terraform is an open-source infrastructure-as-code tool from HashiCorp that lets teams define, provision, and manage cloud and on-prem infrastructure declaratively across many providers. HashiCorp was founded in 2012 by Mitchell Hashimoto and Armon Dadgar, and after AWS introduced CloudFormation in 2011, Hashimoto argued publicly for an open-source, cloud-agnostic equivalent. HashiCorp released Terraform 0.1 in July 2014, initially supporting only AWS and DigitalOcean. Adoption was slow for its first 18 months but accelerated dramatically from around 2017 as the provider ecosystem grew, and Terraform became the de-facto standard for multi-cloud infrastructure as code.

Sources

HashiCorp — Terraform · as of 2026-07-17
HashiCorp — "The Story of HashiCorp Terraform with Mitchell Hashimoto" · as of 2026-07-17

Frequently Asked Questions

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Infrastructure as Code Explained: Terraform Basics

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Terraform Basics: Infrastructure as Code on AWS

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